##########################################################################
#
#  Copyright (c) 2012, John Haddon. All rights reserved.
#
#  Redistribution and use in source and binary forms, with or without
#  modification, are permitted provided that the following conditions are
#  met:
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#      * Redistributions of source code must retain the above
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#      * Redistributions in binary form must reproduce the above
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#        the distribution.
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#      * Neither the name of John Haddon nor the names of
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#  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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##########################################################################

import weakref

import imath

import Gaffer
import GafferUI

from Qt import QtCore
from Qt import QtGui

class PopupWindow( GafferUI.Window ) :

	def __init__( self, title = "GafferUI.Window", borderWidth = 8, child = None, **kw ) :

		GafferUI.Window.__init__( self, title, borderWidth, child = child, sizeMode = GafferUI.Window.SizeMode.Automatic, **kw )

		self.__popupParent = None

		self._qtWidget().setWindowFlags( QtCore.Qt.Popup | QtCore.Qt.FramelessWindowHint )
		self._qtWidget().setAttribute( QtCore.Qt.WA_TranslucentBackground )
		self._qtWidget().paintEvent = _paintWindowBackground.__get__( self._qtWidget() )

		self.keyPressSignal().connect( Gaffer.WeakMethod( self.__keyPress ) )

	## Note : A valid `parent` widget must be supplied if widgets in the PopupWindow
	# are to inherit a display transform from the main UI.
	def popup( self, center = None, parent = None ) :

		if parent is not None :
			self.__popupParent = weakref.ref( parent )
		else :
			self.__popupParent = None

		if center is None :
			center = GafferUI.Widget.mousePosition()

		self.setVisible( True )
		size = self._qtWidget().sizeHint()
		self.setPosition( center - imath.V2i( size.width() / 2, size.height() / 2 ) )

	## Reimplemented from Widget to report the parent passed to `popup()`.
	def parent( self ) :

		if self.__popupParent is not None :
			p = self.__popupParent()
			if p is not None :
				return p

		return GafferUI.Widget.parent( self )

	@classmethod
	def showWarning( cls, warning, parent = None, center = None ) :

		with GafferUI.PopupWindow() as cls.__warningPopup :
			with GafferUI.ListContainer( GafferUI.ListContainer.Orientation.Horizontal, spacing = 4 ) :
				GafferUI.Image( "warningSmall.png" )
				GafferUI.Label( f"<h4>{warning}</h4>" )

		cls.__warningPopup.popup( parent = parent, center = center )

	def __keyPress( self, widget, event ) :

		## \todo This automatic-close behaviour is not always wanted.
		# `PlugPopup` has its own version anyway and we have to disable it
		# manually for `VectorDataWidget`. I suspect we can consolidate
		# most other usages into a `PopupWindow.showWarning()` function,
		# and move the auto-close there.
		if event.key == "Return" :
			# The QAbstractItemView in VectorDataWidget handles auto-close
			# itself, and gets upset if we do it first.
			if self.ancestor( GafferUI.VectorDataWidget ) is None :
				self.close()

def _paintWindowBackground( qWidget, event ) :

	painter = QtGui.QPainter( qWidget )
	painter.setRenderHint( QtGui.QPainter.Antialiasing )

	painter.setBrush( QtGui.QColor( 35, 35, 35 ) )
	painter.setPen( QtGui.QColor( 0, 0, 0, 0 ) )

	radius = qWidget.layout().contentsMargins().left()
	painter.drawRoundedRect( QtCore.QRectF( 0, 0, qWidget.width(), qWidget.height() ), radius, radius )
